#include <iostream>
using std::cout;
using std::endl;

namespace wd
{
int num = 100;

void func(){
    cout << "func" << endl;
}
}//end of namespace wd

namespace hw
{
int num = 100;

void func(){
    cout << "func" << endl;
}
}//end of namespace hw

void test0(){
    cout << wd::num << endl;
    wd::func();
}

int main(void){
    test0();
    return 0;
}
